U.S. patent application number 12/213400 was filed with the patent office on 2009-01-01 for corner bracket.
Invention is credited to Rolf J. Ohrstrom.
Application Number | 20090003928 12/213400 |
Document ID | / |
Family ID | 38830275 |
Filed Date | 2009-01-01 |
United States Patent
Application |
20090003928 |
Kind Code |
A1 |
Ohrstrom; Rolf J. |
January 1, 2009 |
Corner bracket
Abstract
A corner bracket apparatus for a slidable frame includes a body
having first and second arm portions depending therefrom, the first
and second arm portions being oriented generally orthogonally
relative to each other and adapted for insertion into respective
first and second hollow framing members of said slidable frame, the
first arm defining an outboard side edge and an inboard side edge
generally opposite the outboard side edge, and an internal pocket
positioned interiorly of the outboard side edge. The corner bracket
apparatus further includes a lifter member movable coupled to the
body and generally received in the pocket, the lifter member having
a contact portion adapted to bear against a runner along which said
slidable frame is configured to slide, the lifter member being
movable between an advanced position in which the contact portion
is proud of the outboard side edge of the first arm, and a
retracted position in which the contact portion is generally shy of
the outboard side edge of the first arm.
Inventors: |
Ohrstrom; Rolf J.; (Toronto,
CA) |
Correspondence
Address: |
Rolf J. Ohrstrom
13 Snapdragon Drive
Toronto
ON
M2J 4X5
CA
|
Family ID: |
38830275 |
Appl. No.: |
12/213400 |
Filed: |
June 19, 2008 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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11455835 |
Jun 20, 2006 |
|
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12213400 |
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Current U.S.
Class: |
403/205 |
Current CPC
Class: |
E06B 3/9647 20130101;
Y10T 403/72 20150115; E05Y 2600/56 20130101; E05Y 2600/46 20130101;
E06B 3/46 20130101; E05Y 2900/136 20130101; E05D 15/0682 20130101;
E05Y 2600/626 20130101; E05D 15/0647 20130101; E05Y 2600/522
20130101; Y10T 403/42 20150115 |
Class at
Publication: |
403/205 |
International
Class: |
E06B 3/984 20060101
E06B003/984 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 20, 2007 |
CA |
2592471 |
Claims
1. A corner bracket apparatus for a slidable frame, comprising: a)
a body having first and second arm portions depending therefrom,
the first and second arm portions being oriented generally
orthogonally relative to each other and adapted for insertion into
respective first and second hollow framing members of said slidable
frame, the first arm defining an outboard side edge and an inboard
side edge generally opposite the outboard side edge and an internal
pocket positioned therebewteen; b) a lifter member pivotably
coupled to the body and generally received in the pocket, the
lifter member having a contact portion adapted to bear against a
runner along which said slidable frame is adapted to slide; the
lifter member being pivotable between an advanced position in which
the contact portion is proud of the outboard side edge of the first
arm, and a retracted position in which the contact portion is
generally shy of the outboard side edge of the first arm; and c)
biasing means for urging the lifter member towards the advanced
position.
2. The apparatus of claim 1 comprising an adjustment member for
adjusting the retracted position of the lifter member relative to
the body, the retracted position adjustable between a maximum
retraction in which the contact portion is shy of the outboard side
edge of the first arm, and a minimum retraction position in which
the lifter member is disposed at least partially towards the
advanced position.
3. The apparatus of claim 2 wherein the adjustment member comprises
an elongate threaded element having an abutment end engaged by the
lifter member when in the retracted position and an actuating end
opposite the abutment end and accessible through the housing by a
second opening provided in a second sidewall of the housing.
4. The apparatus of claim 1 wherein the body comprises a pivot
boss, and the lifter member comprises a pivot aperture for pivotal
engagement with the pivot boss.
5. The apparatus of claim 4 wherein the body and pivot boss are of
integrally moulded construction.
6. The apparatus of claim 4 wherein the lifter member comprises an
attachment slot extending through the thickness of lifter member
from an outer surface of the lifter member to the pivot aperture
for removable snap-fit coupling between the pivot aperture of the
lifter member and the pivot boss.
7. The apparatus of claim 6 wherein the first opening has a
thickness that is greater than the thickness of the lifter member
such that the lifter member can pass through the first opening for
the removable snap-fit coupling between the pivot aperture of the
lifter member and the pivot boss.
8. The apparatus of claim 6 wherein the pocket is provided
substantially in the first arm and extends longitudinally between a
proximate sidewall near the second arm and a distal sidewall spaced
away from the second arm, and wherein the pivot boss is provided in
the pocket adjacent the distal sidewall such that the contact
portion is positioned longitudinally intermediate the pivot boss
and the proximate sidewall.
9. The apparatus of claim 1 wherein the biasing means comprises a
leaf spring having a first leg bearing against an inner surface of
the pocket and a second leg bearing against the lifter member.
10. The apparatus of claim 1 wherein the contact portion comprises
a glider element.
11. The apparatus of claim 10 wherein the glider element comprises
a concave surface that is stationary relative to the lifter member
and adapted to bear against an upper surface of the runner.
12. The apparatus of claim 10 wherein the glider element comprises
retaining lugs on either side of the concave surface, the retaining
lugs adapted to engage respective opposing side surfaces of the
runner.
13. A corner bracket apparatus for a slidable frame, comprising: a)
a first arm configured for press-fit insertion into a generally
horizontal hollow framing member of said slidable frame when in
use; b) a second arm extending generally orthogonally from the
first arm and configured for press-fit insertion into a generally
vertical hollow framing member of said slidable frame when in use;
c) a pocket in at least one of the first and second arms; d) a
lifter member movably coupled to one of the first and second arms
and received within the pocket, the lifter member movable between
an advanced position in which at least a portion of the lifter
member protrudes outwardly from the first arm in a direction
generally opposite the second arm, and a retracted position in
which the lifter member is generally internal the pocket.
14. The apparatus of claim 13, comprising an outer horizontal
surface generally extending along the first arm and opposite the
second arm, at least a portion of the outer horizontal surface
configured to bear against an inner wall of the first hollow
framing member.
15. The apparatus of claim 14, wherein when in the advanced
position, said portion of the lifter member protrudes proud of a
horizontal plane coplanar with the outer horizontal surface, and
when in the retracted position, said portion of the lifter member
is shy of the horizontal plane.
16. The apparatus of claim 13, wherein the lifter member is
pivotably coupled to said one of the first and second arms.
17. The apparatus of claim 13, comprising a biasing element for
urging the lifter member towards the advanced position.
18. The apparatus of claim 13 comprising a pivot joint for coupling
the lifter member to the body, the pivot joint comprising a socket
provided in the body and a flattened ball portion of the lifter
member disposed opposite the contact portion, the ball portion
retained in the socket and configured to pivot therein.
19. The apparatus of claim 13 wherein the body is of integrally
moulded construction.
Description
[0001] This application is a continuation of prior U.S. application
Ser. No. 11/455,835, filed Jun. 20, 2006, and claims foreign
priority from Canadian Patent Application No. 2,592,471, filed Jun.
20, 2007, each of which is herein incorporated by reference.
FIELD
[0002] The present invention relates to a corner bracket apparatus
with integral lifter member for use in, for example sliding screen
doors.
BACKGROUND
[0003] Corner bracket apparatuses can be used in sliding frames,
such as screen doors, to facilitate joining together the horizontal
and vertical members of the frame, and to provide rollers on which
the screen door frame can roll between open and closed
positions.
[0004] U.S. Pat. No. 4,006,513 (Offterdinger) discloses a runner
wheel support for sliding doors, windows and the like that consists
of a support body which is a press fit in the respective frame, and
which carries the support wheel or roller on an arm carried by a
disengageable pivot. The wheel support arm has a cam member
cooperating with a height adjustment screw and spring fingers on
the support body to hold the wheel support in a stored position
while the support body is fitted into a frame member, and
thereafter to free the wheel support from this stored position and
to hold it in an operative position. Preferably the support body is
of L-shape and acts as a connector to join together mitre-cornered
pieces of frame. Movement of the wheel support arm to a removal
position disengages the cam member from the spring fingers, so that
the arm can be disengaged from the pivot and removed. A spring is
provided to urge the wheel support arm to the operative position,
and the arm is provided with transversely-extending dimples that
engage the bore side walls to centralize the wheel.
[0005] U.S. Pat. No. 4,030,160 (Lambertz et al.) discloses a
combined corner bracket and door roller assembly for use in a
sliding metal patio screen door. The corner bracket is provided
with first pivot means about which a roller assembly pivots during
adjustment and in use. The roller assembly comprises a housing, a
roller, a second pivot means for mounting the roller in the housing
and an elongated curved resilient arm connected to the housing
which provides for resilient mounting and adjustment of the roller
assembly. The second pivot means is positioned between the first
pivot means and the extreme outer vertical edge of the door so that
the roller is positioned much closer to the vertical edge than in
the prior art. By this device the wheel base of the door is
maximized, the door is always resiliently mounted on the track, and
the problem of track jumping is minimized.
[0006] U.S. Pat. No. 4,873,741 (Riegelman) discloses a sliding door
roller apparatus that includes a replaceable wheel assembly that
can be easily removed and replaced on a holding member. The wheel
assembly includes a resilient housing, a wheel, and an axle on
which the wheel turns. The resilient housing has a pair of opposite
facing sidewalls, each having an integral end portion that extends
toward and overlaps the other. Each end portion includes at least
one locking finger that is positionable within an opening on the
holding member. The resiliency of the housing permits the locking
fingers to be placed or removed from an opening located on the
holding member. The apparatus also includes an adjustment mechanism
that positions the wheel assembly outside the sliding door frame to
permit the frame to be properly aligned within its door
opening.
SUMMARY
[0007] The present specification discloses, among other things, one
or more novel corner bracket apparatuses and methods of making and
using such corner bracket apparatuses. Slidable frames
incorporating a corner bracket apparatus are also described, as are
methods for making such frames.
[0008] According to one aspect, a corner bracket apparatus for a
slidable frame includes a first arm configured for press-fit
insertion into a generally horizontal hollow framing member of said
slidable frame when in use; a second arm extending generally
orthogonally from the first arm and configured for press-fit
insertion into a generally vertical hollow framing member of said
slidable frame when in use; a pocket in at least one of the first
and second arms; and a lifter member movably coupled to one of the
first and second arms and received within the pocket, the lifter
member movable between an advanced position in which at least a
portion of the lifter member protrudes outwardly from the first arm
in a direction generally opposite the second arm, and a retracted
position in which the lifter member is generally internal the
pocket.
[0009] According to another aspect, a corner bracket apparatus for
a slidable frame includes a body having first and second arm
portions depending therefrom, the first and second arm portions
being oriented generally orthogonally relative to each other and
adapted for insertion into respective first and second hollow
framing members of said slidable frame, the first arm defining an
outboard side edge and an inboard side edge generally opposite the
outboard side edge and an internal pocket positioned therebewteen.
The corner bracket apparatus further includes a lifter member
pivotably coupled to the body and generally received in the pocket,
the lifter member having a contact portion adapted to bear against
a runner along which said slidable frame is adapted to slide; the
lifter member being pivotable between an advanced position in which
the contact portion is proud of the outboard side edge of the first
arm, and a retracted position in which the contact portion is
generally shy of the outboard side edge of the first arm. The
corner bracket apparatus can further include an optional biasing
element for urging the lifter member towards the advanced
position.
[0010] The corner bracket apparatus can comprise an adjustment
member for adjusting the retracted position of the lifter member
relative to the body, the retracted position adjustable between a
maximum retraction in which the contact portion is shy of the
outboard side edge of the first arm, and a minimum retraction
position in which the lifter member is disposed at least partially
towards the advanced position. The adjustment member can comprise
an elongate threaded element having an abutment end engaged by the
lifter member when in the retracted position and an actuating end
opposite the abutment end and accessible through the body by a
second opening provided in a second sidewall of the housing.
[0011] The body can comprise a pivot boss, and the lifter member
can comprise a pivot aperture for pivotal engagement with the pivot
boss. The lifter member can comprise an attachment slot extending
through the thickness of lifter member from an outer surface of the
lifter member to the pivot aperture for removable snap-fit coupling
between the pivot aperture of the lifter member and the pivot boss.
The first opening can have a thickness that is greater than the
thickness of the lifter member such that the lifter member can pass
through the first opening for the removable snap-fit coupling
between the pivot aperture of the lifter member and the pivot
boss.
[0012] The pocket can be provided substantially in the first arm
and can extend longitudinally between a proximate sidewall near the
second arm and a distal sidewall spaced away from the second arm,
and the pivot boss can be provided in the pocket adjacent the
distal sidewall such that the contact portion is positioned
longitudinally intermediate the pivot boss and the proximate
sidewall.
[0013] The biasing means can comprise a leaf spring having a first
leg bearing against an inner surface of the pocket and a second leg
bearing against the lifter member. The contact portion can comprise
a glider element. The glider element can comprise a convex surface
that is stationary relative to the lifter member and adapted to
bear against an upper surface of the runner. The glider element can
comprise retaining lugs on either side of the convex surface, the
retaining lugs adapted to engage respective opposing side surfaces
of the runner.
[0014] According to another aspect, a corner bracket apparatus for
a slidable frame comprises a body having first and second arm
portions depending therefrom, the first and second arm portions
being oriented generally orthogonally relative to each other and
adapted for insertion into respective first and second hollow
framing members of said slidable frame, the first arm defining an
outboard side edge and an inboard side edge generally opposite the
outboard side edge and an internal pocket positioned therebewteen.
The corner bracket apparatus further comprises a lifter member
pivotably coupled to the body and generally received in the pocket,
the lifter member having a contact portion adapted to bear against
a runner along which said slidable frame is adapted to slide, the
contact portion being fixed relative to the lifter member, the
lifter member being pivotable between an advanced position in which
the contact portion is proud of the outboard side edge of the first
arm, and a retracted position in which the contact portion is
generally shy of the outboard side edge of the first arm. The
corner bracket further comprises biasing means for urging the
lifter member towards the advanced position.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The drawings included herewith are for illustrating various
examples of articles, methods, and apparatuses of the present
specification and are not intended to limit the scope of what is
taught in any way. In the drawings:
[0016] FIG. 1 is a front perspective view of an example of a corner
bracket apparatus according to the present teaching in combination
with a portion of a frame (shown in exploded view) with which the
corner bracket can be used and track along which the frame can
slide;
[0017] FIG. 2 is a front elevation view of an example of the frame
of FIG. 1 with four corner brackets of FIG. 1;
[0018] FIG. 3 is an enlarged perspective view of the corner bracket
of FIG. 1, with a lifter member thereof shown in an advanced
position;
[0019] FIG. 4 is an enlarged perspective view of the corner bracket
of FIG. 1, with a lifter member thereof shown in a retracted
position;
[0020] FIG. 5 is an exploded perspective view of the corner bracket
of FIG. 1;
[0021] FIG. 6 is a top view of a lifter member element of the
corner bracket apparatus of FIG. 1;
[0022] FIG. 7 is an enlarged front perspective view of the corner
bracket of FIG. 1, viewed from another angle, and including
portions of the track of FIG. 1;
[0023] FIG. 8 is a rear perspective view of the corner bracket of
FIG. 1;
[0024] FIGS. 9 and 10 are front views of another example of a
corner bracket apparatus according to the present teaching, showing
a lifter member thereof in advanced and retracted positions,
respectively;
[0025] FIG. 11 is a partially exploded upper perspective view of
another example of a corner bracket apparatus;
[0026] FIG. 12 is a lower perspective view of the apparatus of FIG.
11;
[0027] FIG. 13 is an exploded view of the apparatus of FIG. 11;
[0028] FIG. 14 is an exploded view of a lifter member of the
apparatus of FIG. 11;
[0029] FIG. 15 is an exploded perspective view of the lifter member
of FIG. 14;
[0030] FIG. 16 is a perspective view of the lifter member of FIG.
14 shown in partial break-away;
[0031] FIG. 17 is an enlarged perspective view of a portion of the
lifter member of FIG. 14;
[0032] FIGS. 18 and 19 are perspective views of another example of
a corner bracket apparatus showing a lifter member in the advanced
and retracted positions, respectively;
[0033] FIG. 20 is an exploded view of the apparatus of FIG. 18;
[0034] FIG. 21 is a front elevation view of another example of a
corner bracket apparatus;
[0035] FIG. 22 is a perspective view of the corner bracket
apparatus of FIG. 21; and
[0036] FIGS. 23-26 are photographs showing a sequence of assembling
a corner joint of a frame assembly using the corner bracket
apparatus of FIG. 11.
DETAILED DESCRIPTION
[0037] The following description includes examples of various
methods, systems, apparatuses, or processes to illustrate aspects
of the teaching disclosed herein. The examples described herein are
illustrative and are not intended to limit the scope of any
invention that is defined by one or more claims. The examples and
embodiments described herein can be modified without departing from
the scope of one or more inventions as defined by one or more
claims. A single claimed invention can include features from one or
more examples or embodiments, and the claimed inventions are not
limited to examples or embodiments having all of the features of
any one example or embodiment described herein, or having features
common to multiple or all of the examples or embodiments described
herein. The teaching herein may include particular subject matter
that is beyond the scope of the claims appended hereto. The
applicants, owners, or inventors retain all rights to such
particular subject matter (including, for example, the right to
file divisional or continuation applications related thereto) and
do not merely by the absence of inclusion in claims appended hereto
abandon, disclaim, or dedicate to the public any rights to such
particular subject matter.
[0038] A corner bracket apparatus 110 in accordance with one
example of the applicant's teaching can be seen in FIGS. 1 and 2.
The corner bracket 110 is adapted for use with a slidable frame 90.
In the example illustrated, the slidable frame 90 is in the form of
a sliding patio screen door, having opposed horizontal and vertical
framing members 92, 94, respectively connected at their ends to
form a generally rectangular frame within which is mounted a screen
sheet 95. In the example illustrated, the frame 90 contains four
corner brackets 110, one at each corner. The frame 90 can be
adapted to slide along opposed lower and upper horizontal track
members (or runners) 96, the track members 96 being engaged by
portions of the corner brackets 110, as described in further detail
subsequently herein.
[0039] As can be seen in FIG. 1, the corner bracket 110 comprises a
body 112 with a first arm portion 114 and a second arm portion 116
depending from the body 112. The first and second arm portions 114,
116 are, in the illustrated example, oriented generally
perpendicular relative to each other and are adapted for insertion
into respective first and second (i.e. horizontal and vertical)
hollow framing members 92, 94 of the slidable frame 90. The corner
bracket 110 can thus facilitate joining together the horizontal and
vertical framing members 92, 94 to form the rectangular frame
90.
[0040] Referring now also to FIG. 3, the first arm portion 114
defines an outboard side edge 122 and an inboard side edge 124
generally opposite the outboard side edge 122. In the example
illustrated, the outboard and inboard side edges 122, 124 extend
generally horizontally in the installed position of the frame 90,
and are vertically spaced apart to define the width 126 of the
first arm portion 114. In the example illustrated, the width 126
generally corresponds to the vertical extent of the first arm
portion 114, and is sized to provide a press-fit within the hollow
first framing member 92. The first arm portion 114 also has an end
edge 128 extending between the outboard and inboard side edges 122,
124, distal the second arm portion 116.
[0041] The second arm portion 116 defines an outboard side edge 132
and an inboard side edge 134 generally opposite the outboard side
edge 132. In the example illustrated, the outboard and inboard side
edges 132, 134 extend generally vertically in the installed
position of the frame 90, and are horizontally spaced apart to
define the width 136 of the first arm portion 114. In the example
illustrated, the width 136 generally corresponds to the horizontal
extent of the second arm portion 116, and is sized to provide a
press-fit within the hollow second framing member 94. The second
arm portion 116 also has an end edge 138 extending between the
outboard and inboard side edges 132, 134, distal the first arm
portion 114.
[0042] The outboard and inboard side edges 122, 132 and 124, 134
can be, but need not be, continuous edges extending along the body
112 of the corner bracket 110. The edges 122, 132, 124, 134 can be
discontinuous, and/or can be formed by lugs or bosses extending
from the body 112. In the example illustrated, the outboard side
edges 122, 132 are generally continuous and are, in use, positioned
adjacent an outer periphery of the frame 90, and the inboard side
edges 124, 134 are generally continuous and are, in use, positioned
adjacent an inner periphery of the frame 90.
[0043] The body 112 can further define a thickness 140 that extends
orthogonal to the arm portions 114, 116 (i.e. orthogonal to the
plane of the frame 90). In the example illustrated, the thickness
140 is at least partially defined by upstanding walls of the body
112, including outboard and inboard sidewalls 142, 144,
respectively, and an end wall 148 disposed adjacent the outboard
and inboard side edges 122, 124 and the end edge 128, respectively,
of the first arm portion 114. Similarly, the second arm portion 116
of the body is provided with outboard and inboard sidewalls 152,
154 and an end wall 158 disposed adjacent the outboard and inboard
side edges 132, 134 and the end edge 138 thereof.
[0044] In the example illustrated, the outboard sidewall 142 of the
first arm portion 114 comprises two spaced apart wall segments 142a
and 142b providing a first opening 143 therebetween. Similarly, the
outboard sidewall 152 of the second arm portion 116 comprises two
wall segments 152a and 152b on other side of a second opening 153
provided therebetween. Functions of the openings 143 and 153 are
described subsequently herein.
[0045] The body 112 further includes, in the example illustrated,
an intermediate wall 160 extending at a 45 degree angle relative to
the first and second arms 114, 116. The intermediate wall 160 can
extend from an outboard wall intersection 162 (where the two
outboard side edges 122 and 132 of the body 112 intersect) to an
inboard wall intersection 164 (where the two inboard side edges 124
and 134 of the body 112 intersect). The intermediate wall 160 can
be adapted to align with and provide support for mitered ends 92a,
94a of the first and second framing members 92, 94 (FIG. 1).
[0046] Referring now also to FIGS. 4 and 5, the body 112 defines a
pocket 170 therein. In the example illustrated, the pocket 170 is
disposed substantially in the first arm portion 114, and has a
pocket periphery generally defined by the outboard sidewall 142,
the inboard sidewall 144, the end wall 148, and the intermediate
wall 160.
[0047] The corner bracket apparatus 110 further comprises a lifter
member 174 pivotably coupled to the body by a pivot joint 176, and
generally received in the pocket 170. The lifter member 174 can be
in the form of an arm 178 having a contact portion 180 adjacent one
end thereof, and a pivot connection portion 182 opposite the
contact portion.
[0048] The contact portion 180 is generally adapted to bear against
the runner 96 to facilitate sliding of the frame 90 therealong (see
also FIG. 7). In the embodiment illustrated, the contact portion
180 is in the form of a glider 181 having an engagement surface 184
for bearing against the runner. The engagement surface 184 of the
glider 181 is fixed relative to the lifter member 174, and made of
a material such as a firm plastic that can readily slide over
runners of various materials, including plastics or metal, with
little or no risk of binding. The lifter member 174 with glider 181
can provide advantages over designs providing rollers or wheels,
including reduced cost, more compact, simpler operation and reduced
maintenance requirements.
[0049] In the example illustrated, the engagement surface 184
comprises a generally convex surface disposed between a pair of
retaining lugs 185. The track 96 can include an upstanding rib 96a,
and the engagement surface 184 can generally bear against an upper
surface of the rib 96a (whether the lifter member 174 is in a
partially or fully advanced position, as discussed in greater
detail subsequently herein). Each retaining lug 185 can be disposed
in a respective side of the rib 96a, helping to keep the engagement
surface 184 properly aligned relative to the track 96.
[0050] The lifter member 174 is generally pivotable about the pivot
joint 176 between an advanced position 176a (FIG. 3) in which the
contact portion 180 is proud of the outboard side edge 122 of the
first arm 114, and a retracted position 176b (FIG. 4) in which the
contact portion 180 is generally shy of the outboard side edge 122
of the first arm 114. In the example illustrated, the first opening
143 (between wall segments 142a and 142b) accommodates passage of
the lifter member 174 (or portions thereof) from the retracted to
the advanced position, allowing the contact portion 180 to protrude
past the outboard side edge 122.
[0051] In the example illustrated, the pivot joint 176 comprises
the pivot connection portion 182 of the lifter member 174 and a
pivot boss 188 fixed to the body 112 (FIG. 4). The pivot connection
portion 182 can comprise a pivot aperture 190 for receiving the
pivot boss 188. The pivot connection portion 182 can further
comprise an attachment slot 192 extending through the thickness 194
of lifter member 174 from a peripheral surface 196 of the lifter
member 174 to the pivot aperture 190 for removable snap-fit
coupling between the pivot aperture 190 and the pivot boss 188. The
pivot joint 176 can further comprise a retainer 198 for preventing
the lifter member 174 from sliding off the pivot boss 188 along the
pivot axis defined thereby. In the example illustrated, the
retainer 198 comprises a retaining flange 199 extending laterally
outwardly from an upper end of the pivot boss 188.
[0052] In the example illustrated, the pivot joint 176 (and pivot
boss 188 thereof) is positioned inboard of the contact portion 180
of the lifter member 174. This helps to maximize the horizontal
spacing between the contact portions 180 of corner brackets 110
located at opposite sides of the frame 90 (see FIG. 2), which in
turn can help to inhibit rocking of the frame 90 between the upper
and lower rails 96. More particularly, the first end wall 148 of
the first arm portion 114 presents a distal wall of the pocket 170,
and the intermediate wall 160 presents a proximate wall of the
pocket 170, relative to the second arm portion 116. The pivot joint
176 is provided in the pocket 170 adjacent the distal wall 148, and
the contact portion 180 of the lifter member 174 is positioned
longitudinally (along a horizontal axis) between the proximate wall
160 and the pivot axis 176.
[0053] The corner bracket 110 is, in the example illustrated,
further provided with biasing means 202 for urging the lifter
member 174 towards the advanced position 176a. The biasing means
202 can be in the form of a leaf spring 204 comprising a strip of
spring steel having two spaced-apart legs 206, namely, a fixed leg
206a and a pivot leg 206b. The fixed leg 206a can be anchored to
the body 112, and the pivot leg 206b can bear against the lifter
member 174, urging the lifter member 174 towards the advanced
position 176a.
[0054] In the example illustrated, to facilitate assembly of the
biasing means 202, the body 112 is provided with upstanding
retaining bosses 208 adjacent the inboard sidewall 144 of the first
arm portion 114 to retain the fixed leg 206a between the retaining
bosses 208 and the inboard sidewall 144. The lifter member 174 can
be urged towards the retracted position 176b by overcoming the
spring force of the biasing means 202 and pivoting the lifter
member 174 about the pivot joint 176, forcing the pivot leg 206b
towards the fixed leg 206a, the fixed leg 206a bearing against an
inner surface of the inboard sidewall 144.
[0055] Movement of the lifter member 174 to the retracted position
176b can facilitate assembly of the corner bracket apparatus into
the frame 90. The lifter member 174 and biasing means 202 can be
pre-assembled to the body 112. The retainer 198 can ensure that the
lifter member 174 does not become separated from the pre-assembled
corner bracket apparatus 110. The frame 90 can be assembled by
inserting the first arm 114 of the apparatus 110 into the hollow of
the first framing member 92. Upon insertion, the lifter member 174
pivots to enable passage thereof through the hollow of the framing
member 92--the mitered end 92a pushes the lifter member 174 to the
retracted position. Upon registration of the first opening 143 of
the first arm portion of the apparatus 110 with a corresponding
first opening 97a in the first framing member 92, the lifter member
174 can return to the advanced position under the influence of the
biasing member 202.
[0056] The second arm portion 116 of the apparatus 110 can be
inserted in the second framing member 94, so that a first corner of
the frame 90 is assembled. The same procedure can be followed for
the remaining three corners. The screen sheet 95 can then be
secured to the members 92, 94 to complete the assembled frame
90.
[0057] After the frame 90 has been assembled, the lifter member 174
can be removed from a corresponding apparatus 110 by pulling the
lifter member 174 through the registered first openings 97a, 143,
separating the pivot connection portion 182 from the pivot joint
176. A new lifter member 174 can be connected to the body 112 of
the apparatus 110 by inserting the pivot connection portion 182
thereof through the registered openings 97a, 143 and snap-fit
assembling the pivot joint 176. The frame 90 can remain intact for
replacement (and/or installation) of the lifter member 174.
[0058] The corner bracket apparatus 110 can further be provided
with an adjustment member 212 for limiting the amount of retraction
of the lifter member 174 relative to the body 112. The adjustment
member 212 can be anchored or supported within a bore 213 provided
in the body 112. The adjustment member 212 can comprise an elongate
threaded element 214 having an abutment end 216 adapted to bear
against the lifter member 174 to limit the retraction thereof, and
an actuating end 218 opposite the abutment end 216 and accessible
through the body 112 by the second opening 153 provided in the
second outboard sidewall 152 of the housing adjacent the bore 213.
As seen in FIG. 1, the second framing member 94 is provided with a
second frame opening 97b that is aligned with the second opening
153 of the apparatus 110 in the assembled frame 90, providing
access to the actuating end 218 of the adjustment member 212.
[0059] In the example illustrated, the adjustment member 212 can be
selectively positioned between a withdrawn position (FIGS. 3 and 4)
and a forward position (FIGS. 1 and 7). This permits a
corresponding adjustment in the amount of retraction of the lifter
member 174 between a maximum retraction (FIGS. 3 and 4), in which
the contact portion 180 is shy of the outboard side edge 122 of the
first arm 114, and a minimum retraction (FIGS. 1 and 7) in which
the lifter member 174 can only be retracted partially, or in other
words, is maintained at least partially towards the advanced
position.
[0060] By advancing the abutment end 216 of the adjustment member
212 towards the lifter member 174, the lifter member 174 can be
maintained in an at least partially advanced position, thereby
taking up any excess vertical slack between the frame 90 and the
opposed tracks 96. Removal of such slack can help to prevent the
frame 90 from jumping or otherwise disengaging the tracks 96. As
well, corner brackets 110 at the left and right sides of the frame
90 (FIG. 2) can be adjusted individually to true up the alignment
of the frame 90 relative to the horizontal tracks 96 and/or
relative to vertical sides (not shown) of the doorway opening
against which the vertical frame members 94 may be adapted to
abut.
[0061] Referring to FIGS. 7 and 8, the body 112 of the apparatus
110 can advantageously be of a plastic material and can be
manufactured by an injection moulding process. In the example
illustrated, the body 112 is designed to facilitate injection
moulding. For example, the material of the body 112 forming the
bore 213 for supporting the adjustment member can be provided in
staggered formation. The staggered formation includes offset
semi-circular bands of material that are provided along the axial
length of the bore for the adjustment member 212, wherein a band on
one side of the bore is matched with a gap or void on the radial
side opposite the band. In particular, on the front side (FIG. 7)
of the bore 213, first and second bands 222a and 222b are provided
along the bore 213. The first front band 222a is spaced apart from
the opening 153 of the bore by a first front gap 224a, and the
first and second front bands 222a, 222b are separated form each
other by a second front gap 224b. On the rear side (FIG. 8) of the
bore 213, first and second rear bands 226a, 226b are provided. The
first rear band 226a generally extends axially from the opening 153
of the bore 213. First and second rear gaps are provided on axially
opposite sides of the second rear band 226b. The front bands 222a,
222b are disposed generally opposite the rear gaps 228a, 228b. The
rear bands 226a, 226b are disposed generally opposite the front
gaps 224a, 224b.
[0062] To further facilitate manufacture by injection moulding, the
body 112 has a void 230 in the shape of, and opposite of, the
retaining flange 199. Furthermore, the wall thicknesses are
generally uniform throughout the body 112, which can facilitate
resin flow in an injection mould. As well, the various upstanding
features and returns are provided in the line of draw, facilitating
injection moulding with relatively simple dies that can be free of
slides or lifts, thereby minimizing cost of dies and reducing cycle
times for moulding operations.
[0063] An alternative example of a corner bracket apparatus 310 can
be seen in FIGS. 9 and 10. The corner bracket apparatus 310 is
similar to the corner bracket apparatus 110, and like features are
identified by like reference characters, incremented by 200. The
corner bracket apparatus 310 has a body 312 with a lifter member
374 attached thereto at a pivot joint 376. The lifter member 374 is
pivotable between an advanced position 376a (FIG. 9) and a
retracted position 376b (FIG. 10). The pivot joint 376 comprises
the pivot connection portion 382 of the lifter member 374 and a
pivot socket 388 provided in the body 112. In the example
illustrated, the pivot connection portion 382 comprises a flattened
ball end 383 presenting an outer convex surface. The socket 388 is
shaped to receive the ball end 383, and presents an inner concave
surface to be engaged by the outer convex surface of the ball end
383.
[0064] The socket 388 has a socket opening 389 generally facing the
first opening 343 of the body 312. The socket opening 389 has a
width 395 extending between first and second wall segments 391,
393, respectively. The width 395 of the socket opening 389 is, in
the example illustrated, narrower than the width of the ball end
383 of the lifter member 374. At least one wall segment 393 can be
resiliently flexible to permit the width of the socket opening to
be increased. In this way, the ball end 383 of the lifter member
can be pressed through the socket opening to provide a removable
snap-fit assembly of the pivot joint 376. The pivot joint 376 can
further be provided with a modified retainer 398 in the form of a
strap 399 extending across the top of the socket 388.
[0065] Another example of a corner bracket apparatus 510 can be
seen in FIGS. 11 and 12. The corner bracket apparatus 510 is
similar to the corner bracket apparatus 310, and like features are
identified by like reference characters, incremented by 200.
[0066] The corner bracket apparatus 510 has a body 512 with a first
arm 514 a first arm configured for press-fit insertion into a
generally horizontal hollow framing member 92 of a slidable frame
90 (c.f. FIG. 2) when in use, and a second arm 516 extending
generally orthogonally from the first arm 514 and configured for
press-fit insertion into a generally vertical hollow framing member
94 of the slidable frame 90.
[0067] The apparatus 510 further includes a pocket 570 in at least
one of the first and second arms 514, 516. In the example
illustrated, the pocket 570 is disposed substantially in the first
arm 514.
[0068] The apparatus 510 further includes a lifter member 574
movably coupled to one of the first and second arms 514, 516 of the
body 512 and received within the pocket 570. The lifter member 574
is movable between an advanced position in which at least a portion
of the lifter member 574 protrudes outwardly from the first arm 514
in a direction generally opposite the second arm 516, and a
retracted position in which the lifter member is generally internal
the pocket 574. The lifter member 574 can optionally be biased
towards the advanced position by a biasing means 602, such as, for
example, but not limited to, a spring 604.
[0069] In the example illustrated, the lifter member 574 is movably
coupled to the body 512 at a pivot joint 576. The lifter member 574
is movable between the advanced and retracted positions by pivoting
about the pivot joint 576. The pivot joint 576 comprises a pivot
connection portion 582 of the lifter member 574 and a pivot socket
588 provided in the body 512. In the example illustrated, the pivot
connection portion 582 comprises a flattened ball end 583
presenting an outer convex surface. The socket 588 is shaped to
receive the ball end 583, and presents an inner concave surface to
be engaged by the outer convex surface of the ball end 583.
[0070] The socket 588 has a socket opening 589 generally facing the
first opening 543 of the body 512. The socket opening 589 has a
width 595 extending between first and second wall segments 591,
593, respectively. The width 595 of the socket opening 589 is, in
the example illustrated, narrower than the width of the ball end
583 of the lifter member 574. At least one wall segment 591, 593
can be resiliently flexible to permit the width of the socket
opening 589 to be increased by urging apart the wall segments 591
and 593. In this way, the ball end 583 of the lifter member can be
pressed through the socket opening 589 to provide a removable
snap-fit assembly of the pivot joint 576. The pivot joint 576 can
further be provided with a modified retainer 598 in the form of a
strap 599 extending across the top of the socket 588.
[0071] Referring now to FIG. 14, the lifter member 574 in the
example illustrated comprises two shells 651 (identified
individually as first shell 651a and second shell 651b). The shells
651a, 651b are, in the example illustrated, identical to each
other, and can be made, for example, by injection molding using a
single mold cavity.
[0072] Each shell 651 includes a central portion 653 having a pair
of upstanding ribs 655 extending lengthwise thereof and forming a
recess between the ribs 655. In the example illustrated, the ribs
are laterally offset with respect to a central longitudinal axis of
the shell 651, and include a laterally outer rib 655a and a
laterally inner rib 655b. Each inner rib 655b includes a barb 656
directed towards the outer rib 655b (FIG. 15).
[0073] Each shell 651 in the example illustrated further includes a
flattened disc 657 attached to one end of the central portion, and
a roller support 659 attached to the central portion at the
opposite end. The roller support is used, in the example
illustrated, to support a roller 660. The roller support 659
includes a base 661 joined to the central portion 653, and an axle
segment 663 directed laterally inwardly from the base 661. The axle
segment can comprise a cylindrical post 664 extending about half
way across the thickness of the assembled lifter member 574. The
axle segment can include nesting protrusions 665 extending from the
end of the post 664. In the example illustrated, the nesting
protrusions 665 comprise two protrusions that are pie-shaped
(sectors) in cross-section, centered at 45 degrees with respect to
the lengthwise axis of the lifter member 574 and diametrically
opposite each other. This provides sector-shaped spaces between the
protrusions 665, in which the protrusions 665 of the opposing shell
651 can nest upon assembly of the two shells 651.
[0074] To assemble the lifter member 574, the roller can be placed
over the axle segment of the first shell 651a. The second shell
651b can then be fit over the first shell 651a by inserting the
axle segment 663 into the hub of the roller 660 and aligning the
laterally inner ribs 655b with the recesses of the first and second
shells 651a, 651b. The two shells 651 can then be pressed together,
urging the barbs 656 past each other and effecting assembly of the
shells in snap fit. The protrusions 665 of the roller support 659
nest together upon assembly, providing lateral support at the joint
between the axle segments 663 of the respective shells 651. The
attached central portions 653 form the arms 578 of the lifter
member 574, and the flattened discs 657 cooperate to form the pivot
connection portion 582 of the lifter member 574.
[0075] Referring again to FIGS. 11 and 13, the corner bracket
apparatus 510 can comprise optional shims to adjust the thickness
540 and/or widths 526, 536 of one or both arms 514, 516. The shims
can include a face shim 671 that is placed flush against one or
both side faces of the body 512 of the apparatus 510. In the
example illustrated, face shims 671 are placed against both side
faces of the body 512, and secured thereto in snap fit by inserting
pins 673 depending from an inner surface of each face shim 671 into
attachment recesses 675 provided in the body 512 (FIG. 13). The
face shims 671 are, in the example illustrated, generally L-shaped,
one arm of each L generally corresponding to one of the arms 514,
516 of the body 512. Leading edges 677 of the shim arms can be
beveled to facilitate insertion into the respective hollow frame
members 92, 94. The face shims 671 can increase the thickness 540
of the apparatus 510 (FIG. 12) to facilitate providing a press fit
within a frame member 92, 94.
[0076] The shims can also or alternatively include a wall shim 681
that can be positioned in flush engagement with one or both inner
side surfaces 524, 534 of the arms 514, 516 respectively. In the
example illustrated, the wall shims 681 comprise first and second
wall segments 681a, 681b that are positioned parallel to and flush
with the inboard sidewalls 544, 554 of the arms 514, 516
respectively. The wall segments 681a, 681b of the wall shim 681 can
be joined together, and can be attached to the body 512 by an
attachment element such as, for example, a tab 683 extending from
the wall shim and receivable in sliding fit in a slot 685 provided
in the body 512 (FIG. 13).
[0077] Referring now to FIGS. 18-20, another example of a corner
bracket apparatus 710 is described. The apparatus 710 is similar to
the apparatus 110, and like features are identified by like
reference characters, incremented by 600. The apparatus 710
includes a body 712 with first and second arms 714, 716.
[0078] The apparatus further includes a lifter member 774 that is
movably retained within at least one of the arms. In the example
illustrated, the body 712 comprises a pocket 770 that is generally
channel shaped, extending inwardly from the outer horizontal edge
722, in a direction parallel to the direction in which the second
arm 716 extends. In the example illustrated, the pocket 770 extends
substantially through the interior of the second arm 716.
[0079] In the example illustrated, the lifter member 774 comprises
a shoe 778 that is slidable within the pocket 770. The shoe has a
contact portion 780 joined at one end thereof, which may comprise a
glider or roller element.
[0080] The inner surfaces of the pocket 770, along with retaining
bands 771 and a lip 773 around the first arm opening 743 (FIG. 20)
cooperate to form a slidable coupling 776 between the lifter member
774 and the body 712 of the apparatus 710. The lifter member 774 is
movable between an advanced position 776a (FIG. 18), in which a
contact portion 780 of the lifter member 774 protrudes proud of the
outer horizontal edge 722, and a retracted position 776b (FIG. 19),
in which the contact portion 780 of the lifter member 774 is shy of
the outer horizontal edge 722. The shoe can have retaining tabs 779
extending laterally outwardly thereof and engageable with an
interior surface of the lip 773 to retain the shoe in coupled
engagement with the body 712 of the apparatus 710.
[0081] The lifter member can comprise an optional biasing element
802 for urging the shoe towards an advanced position 776a. In the
example illustrated, the biasing element 802 comprises a
compression spring 804 disposed between an end wall 758 of the
second arm 716 and an opposing surface of the shoe 778 of the
lifter member 774. Two compression springs 804 can be provided, and
a guide rod 805 can extend internally of each spring.
[0082] In use, the lifter member 774 can be fixed at a desired
position (e.g. at or near the advanced position 776a) by tightening
a set screw 812. The set screw 812 can be accessed through the
second frame opening 97b which is configured to be in registration
with the second arm opening 753.
[0083] Referring now to FIGS. 21-22, another example of a lifter
member 910 is described. The apparatus 910 is similar to the
apparatus 110, and like features are identified by like reference
characters, incremented by 800. The apparatus 910 includes a body
912 with first and second arms 914, 916. The body 912 is further
provided with profiled panels 917 on the opposing side faces 918 of
the body 912. The profiled panels 917 are configured to remain
visible after assembly of the apparatus 910 with the framing
members 92, 94, and can be shaped to match the outer profile or
contour of the framing members 92, 94 in which the arms 914, 916
are to be inserted. The profiled panels 917 are, in the example
illustrated, generally square when viewed from a front elevation
(FIG. 21), having inboard and outboard vertical edges 918a, 918b
and inboard and outboard horizontal edges 919a, 919b. The inboard
edges 918a, 919b are perpendicular to the direction in which the
arms 914, 916 (respectively) extend. This can allow the ends of the
framing members 92, 94 to be cut square, rather than at an angle,
and can
EXAMPLE
[0084] Referring to FIG. 23, a corner bracket apparatus was made
generally conforming to the design of the corner bracket apparatus
510. Four of the corner brackets 510 were then used to make a
sliding screen door frame 90. The screen door was made by cutting
the vertical and horizontal frame members 92, 94 to length, with 45
degree mitered ends 92a, 94a.
[0085] Four assembled corner bracket apparatuses 510 (including
movable lifter members 574) were then installed, by pressing the
arm 514 of one apparatus 510 into an open end of one of the
horizontal frame members 92 in direction of arrow "A" (FIG. 24).
The horizontal member 92 had an opening sized to receive the width
and thickness of the arm 514 in press fit.
[0086] Accordingly, while pressing the arm 514 into the frame
member 92, the lifter member was moved (in direction of arrow "B")
to the retracted position by the internal surfaces defining the
hollow interior of the frame member 92 (and by pushing against the
optional biasing means 602, if provided). The arm 514 was pressed
into the frame member 92 a sufficient depth so that the first arm
opening 543 of the arm 514 was in registration with the first frame
member opening 97a in the frame member 92. This was repeated for
the remaining three open ends of the horizontal frame members
92.
[0087] The vertical frame members 94 were then assembled by pushing
the second arms 516 into the open ends of the vertical framing
members 94 (FIG. 25). At full insertion depth, the mitered ends 94a
of the vertical members 94 abut the mitered ends 92a of the
horizontal members 92, and the second arm opening 553 was in
registration with the second frame member opening 97b (FIG.
26).
[0088] The press-fit of the corner bracket apparatuses 510 in the
framing members 92, 94 was sufficient to hold the frame 90
together. Optional locking tabs can be provided on an exterior
surface of the apparatus 410 to engage an aperture in the frame
(e.g. one or more of the first or second frame apertures 97a, 97b,
or another aperture) to resist removal of either or both arms 414,
416 from the respective framing member 92, 94. Alternatively or
additionally, fasteners could optionally be inserted through the
frame members and into the apparatuses 510. In this example, the
press-fit of the arms 414, 416 into the frame members 92, 94 was
found to provide a sufficiently strong corner joint. The strength
of the frame 90 was further increased once the screen sheet 95 was
securely mounted thereto.
[0089] The assembled frame 90 was then inserted in a door
frame.
[0090] This was done by aligning the frame 90 between upper and
lower runners, and then adjusting the adjustment member 612 to urge
the lifter members 574 towards an advanced position in which the
contact portions (i.e. rollers 660 in this example) protruded proud
of the outer side edge of the first arm 614. The two apparatuses
510 at the lower two corners of the frame 90 were adjusted so that
the frame 90 was level and moved smoothly across the lower rail.
The upper two apparatuses 510 were adjusted to reduce the amount of
vertical slack between the upper rail and the rollers 660, to help
avoid rocking of the frame 90 when opened and closed and to help
keep the frame 90 properly seated between the upper and lower
rails.
[0091] It is to be understood that what has been described are
preferred examples of the teaching disclosed herein. The disclosure
nonetheless is susceptible to certain changes and formation of
alternative examples that remain within the scope of what is taught
herein.
* * * * *